package com.cdh.edu.service.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.cdh.base.DIYException;
import com.cdh.edu.entity.Subject;
import com.cdh.edu.entity.excel.SubjectData;
import com.cdh.edu.service.SubjectService;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring进行管理，需要自己new，不能注入其他对象
    //不能实现数据库操作
    public SubjectService subjectService;
    public SubjectExcelListener(){}
    public SubjectExcelListener(SubjectService subjectService) {
        this.subjectService = subjectService;
    }

    @Override
    public void invoke(SubjectData data, AnalysisContext context) {
        if (data == null){
            throw new DIYException(201,"文件数据异常");
        }

        // 一行一行读取，每次读取两个值，第一个值是一级分类，第二个值是二级分类
        //添加一级分类 判断一级分类是否重复
        Subject existOneSubject = this.existOneSubject(subjectService, data.getOneSubjectName());
        if (existOneSubject == null){
            existOneSubject = new Subject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(data.getOneSubjectName());
            subjectService.save(existOneSubject);
        }

        // 获取一级分类的ID值
        String pid = existOneSubject.getId();

        //添加二级分类 判断二级分类是否重复
        Subject existTwoSubject = this.existTwoSubject(subjectService, data.getOneSubjectName(),pid);
        if (existTwoSubject == null){
            existTwoSubject = new Subject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(data.getTwoSubjectName());
            subjectService.save(existTwoSubject);
        }

    }

    //判断一级分类不能重复添加
    private Subject existOneSubject(SubjectService subjectService,String name){
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        Subject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private Subject existTwoSubject(SubjectService subjectService,String name,String pid){
        QueryWrapper<Subject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        Subject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {

    }
}
